Fig 3.

A, Maximum intensity projection from an MRA performed on POD 9 demonstrates near-complete thrombosis of the aneurysm fundus. The left PICA remains patent, filling from a tiny niche of residual flow in the region of the aneurysm neck (arrow). B, Axial postcontrast T1-weighted sequence demonstrates linear enhancement of the aneurysm wall marginating the intra-aneurysmal thrombus. A focal niche of enhancement corresponds to the small neck remnant, which allows the patency of the PICA (arrow).